(*
 * DGL(The Delphi Generic Library)
 *
 * Copyright (c) 2004
 * HouSisong@263.net
 *
 * This material is provided "as is", with absolutely no warranty expressed
 * or implied. Any use is at your own risk.
 *
 * Permission to use or copy this software for any purpose is hereby granted
 * without fee, provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 *
 *)

//------------------------------------------------------------------------------
// _TPointerItBox的實現
// Create by HouSisong, 2005.04.14
//------------------------------------------------------------------------------

{$ifndef  __PointerItBox_inc_pas_}
{$define  __PointerItBox_inc_pas_}

//PointerItBox.inc_h ; PointerItBox.inc_pas


{$I DGLIntf.inc_pas}


{ _IPointerItBox }

procedure _IPointerItBox._SetPointer(const aPointer : _TNudePointerType);
begin
  self._ObjIteratorClass:=_TPointerItBox_Obj;
  _TNudePointerType(self._Data0):=aPointer;
end;

procedure _IPointerItBox.SetPointer(const aPointerItBox : _IPointerItBox);
begin
  self._ObjIteratorClass:=aPointerItBox._ObjIteratorClass;
  _TNudePointerType(self._Data0):=_TNudePointerType(aPointerItBox._Data0);
end;

procedure _IPointerItBox.SetPointerNil();
begin
  self._ObjIteratorClass:=_TPointerItBox_Obj;
  self._Data0:=0;
end;

procedure _IPointerItBox.SetPointer(const aPointer : _TNudePointerType);
begin
  self._ObjIteratorClass:=_TPointerItBox_Obj;
  _TNudePointerType(self._Data0):=aPointer;
end;

procedure _IPointerItBox.SetPointer(const aPointer : _TNudePointerType;const Step:integer);
begin
  self._ObjIteratorClass:=_TPointerItBox_Obj;
  self._Data0:= integer(aPointer)+Step*(sizeof(_ValueType)) ;
end;

function  _IPointerItBox.getPointer():_TNudePointerType;
begin
  result:=_TNudePointerType(self._Data0);
end;

procedure _IPointerItBox.SetValue(const aValue: _ValueType);
begin
  {$ifdef _DGL_ObjValue}
  _Assign(_TNudePointerType(Self._Data0)^,aValue);
  {$else}
  _TNudePointerType(Self._Data0)^:=aValue;
  {$endif}
end;
function  _IPointerItBox.GetValue(): _ValueType;
begin
  result:=_TNudePointerType(Self._Data0)^;
end;
function  _IPointerItBox.GetNextValue(const Step:integer): _ValueType;
begin
  result:=_TNudePointerType(Self._Data0+Step*sizeof(_ValueType))^;
end;
procedure _IPointerItBox.SetNextValue(const Step:integer;const aValue:_ValueType);
begin
  {$ifdef _DGL_ObjValue}
  _Assign(_TNudePointerType(Self._Data0+Step*sizeof(_ValueType))^,aValue);
  {$else}
  _TNudePointerType(Self._Data0+Step*sizeof(_ValueType))^:=aValue;
  {$endif}
end;
function  _IPointerItBox.IsEqual(const Iterator:_IIterator):boolean;
begin
  result:=(Self._Data0=Iterator._Data0);
end;
function  _IPointerItBox.Distance(const Iterator:_IIterator):integer;
begin
  result:=(Iterator._Data0-Self._Data0) div sizeof(_ValueType);
end;
procedure _IPointerItBox.Assign (const Iterator:_IIterator);
begin
  Self._ObjIteratorClass:=Iterator._ObjIteratorClass;
  Self._Data0:=Iterator._Data0;
end;
procedure _IPointerItBox.Next();
begin
  inc(PByte(Self._Data0),sizeof(_ValueType));
end;
procedure _IPointerItBox.Next(const Step:integer);
begin
  inc(PByte(Self._Data0),Step*sizeof(_ValueType));
end;
procedure _IPointerItBox.Previous();
begin
  dec(PByte(Self._Data0),sizeof(_ValueType));
end;
function  _IPointerItBox.Clone():_IIterator;
begin
  result._ObjIteratorClass:=self._ObjIteratorClass;
  result._Data0:=self._Data0;
end;
function  _IPointerItBox.Clone(const NextStep:integer):_IIterator;
begin
  result._ObjIteratorClass:=self._ObjIteratorClass;
  result._Data0:=self._Data0+NextStep*sizeof(_ValueType);
end;

function _IPointerItBox.IteratorTraits():TIteratorTraits;
begin
  result:=itRandomAccessTag;
end;


{ _TPointerItBox_Obj }

class procedure _TPointerItBox_Obj.ItCreate(var SelfItData:_IIterator;const aPointer : _TNudePointerType);
begin
  SelfItData._ObjIteratorClass:=_TPointerItBox_Obj;
  _TNudePointerType(SelfItData._Data0):=aPointer;
end;


class procedure _TPointerItBox_Obj.SetValue(const SelfItData:_IIterator;const aValue: _ValueType);
begin
  {$ifdef _DGL_ObjValue}
  _Assign(_TNudePointerType(SelfItData._Data0)^,aValue);
  {$else}
  _TNudePointerType(SelfItData._Data0)^:=aValue;
  {$endif}
end;

class function  _TPointerItBox_Obj.GetValue(const SelfItData:_IIterator): _ValueType;
begin
  result:=_TNudePointerType(SelfItData._Data0)^;
end;

class function  _TPointerItBox_Obj.GetNextValue(const SelfItData:_IIterator;const Step:integer): _ValueType;
begin
  result:=_TNudePointerType(integer(_TNudePointerType(SelfItData._Data0))+Step*(sizeof(_ValueType)))^;
end;

class procedure _TPointerItBox_Obj.SetNextValue(const SelfItData:_IIterator;const Step:integer;const Value:_ValueType);
begin
  {$ifdef _DGL_ObjValue}
  _Assign(_TNudePointerType(integer(_TNudePointerType(SelfItData._Data0))+Step*(sizeof(_ValueType)))^,Value);
  {$else}
  _TNudePointerType(integer(_TNudePointerType(SelfItData._Data0))+Step*(sizeof(_ValueType)))^:=Value;
  {$endif}
end;

class function  _TPointerItBox_Obj.IsEqual(const SelfItData:_IIterator;const Iterator:_IIterator):boolean;
begin
  result:=(_TNudePointerType(SelfItData._Data0)=_TNudePointerType(Iterator._Data0));
end;

class function  _TPointerItBox_Obj.Distance(const SelfItData:_IIterator;const Iterator:_IIterator):integer;
begin
  result:=( integer(_TNudePointerType(Iterator._Data0)) - integer(_TNudePointerType(SelfItData._Data0)) )
     div (sizeof(_ValueType));
end;

class procedure _TPointerItBox_Obj.Assign (var SelfItData:_IIterator;const Iterator:_IIterator);
begin
  SelfItData._ObjIteratorClass:=Iterator._ObjIteratorClass;
  _TNudePointerType(SelfItData._Data0):=_TNudePointerType(Iterator._Data0);
end;

class procedure _TPointerItBox_Obj.Next(var SelfItData:_IIterator);
begin
  inc(PByte(SelfItData._Data0),(sizeof(_ValueType)));
end;

class procedure _TPointerItBox_Obj.Next(var SelfItData:_IIterator;const Step:integer);
begin
  inc(PByte(_TNudePointerType(SelfItData._Data0)),Step*(sizeof(_ValueType)));
end;

class procedure _TPointerItBox_Obj.Previous(var SelfItData:_IIterator);
begin
  dec(PByte(_TNudePointerType(SelfItData._Data0)),(sizeof(_ValueType)));
end;

class function  _TPointerItBox_Obj.Clone(const SelfItData:_IIterator):_IIterator;
begin
  result._ObjIteratorClass:=SelfItData._ObjIteratorClass;
  result._Data0:=SelfItData._Data0;
end;

class function  _TPointerItBox_Obj.Clone(const SelfItData:_IIterator;const NextStep:integer):_IIterator;
begin
  result._ObjIteratorClass:=SelfItData._ObjIteratorClass;
  result._Data0:=SelfItData._Data0;
  inc(PByte(_TNudePointerType(result._Data0)),NextStep*(sizeof(_ValueType)));
end;

class function _TPointerItBox_Obj.IteratorTraits():TIteratorTraits;
begin
  result:=itRandomAccessTag;
end;

function PointerBox(const aPointer : _TNudePointerType):_IVectorIterator; overload;
begin
  result._ObjIteratorClass:=_TPointerItBox_Obj;
  _TNudePointerType(result._Data0):=aPointer;
end;

function PointerBox(const aPointer : _TNudePointerType;const NextStep:integer):_IVectorIterator; overload;
begin
  result._ObjIteratorClass:=_TPointerItBox_Obj;
  _TNudePointerType(result._Data0):=aPointer;
  inc(PByte(_TNudePointerType(result._Data0)),NextStep*(sizeof(_ValueType)));
end;

{$endif } //  __PointerItBox_inc_pas_